1 //===- DeclBase.cpp - Declaration AST Node Implementation -----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the Decl and DeclContext classes.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/AST/DeclBase.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/DeclContextInternals.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/DependentDiagnostic.h"
27 #include "clang/AST/ExternalASTSource.h"
28 #include "clang/AST/Stmt.h"
29 #include "clang/AST/Type.h"
30 #include "clang/Basic/IdentifierTable.h"
31 #include "clang/Basic/LLVM.h"
32 #include "clang/Basic/LangOptions.h"
33 #include "clang/Basic/ObjCRuntime.h"
34 #include "clang/Basic/PartialDiagnostic.h"
35 #include "clang/Basic/SourceLocation.h"
36 #include "clang/Basic/TargetInfo.h"
37 #include "llvm/ADT/ArrayRef.h"
38 #include "llvm/ADT/PointerIntPair.h"
39 #include "llvm/ADT/SmallVector.h"
40 #include "llvm/ADT/StringRef.h"
41 #include "llvm/Support/Casting.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/VersionTuple.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include <algorithm>
47 #include <cassert>
48 #include <cstddef>
49 #include <string>
50 #include <tuple>
51 #include <utility>
52
53 using namespace clang;
54
55 //===----------------------------------------------------------------------===//
56 // Statistics
57 //===----------------------------------------------------------------------===//
58
59 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0;
60 #define ABSTRACT_DECL(DECL)
61 #include "clang/AST/DeclNodes.inc"
62
updateOutOfDate(IdentifierInfo & II) const63 void Decl::updateOutOfDate(IdentifierInfo &II) const {
64 getASTContext().getExternalSource()->updateOutOfDateIdentifier(II);
65 }
66
67 #define DECL(DERIVED, BASE) \
68 static_assert(alignof(Decl) >= alignof(DERIVED##Decl), \
69 "Alignment sufficient after objects prepended to " #DERIVED);
70 #define ABSTRACT_DECL(DECL)
71 #include "clang/AST/DeclNodes.inc"
72
operator new(std::size_t Size,const ASTContext & Context,unsigned ID,std::size_t Extra)73 void *Decl::operator new(std::size_t Size, const ASTContext &Context,
74 unsigned ID, std::size_t Extra) {
75 // Allocate an extra 8 bytes worth of storage, which ensures that the
76 // resulting pointer will still be 8-byte aligned.
77 static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
78 "Decl won't be misaligned");
79 void *Start = Context.Allocate(Size + Extra + 8);
80 void *Result = (char*)Start + 8;
81
82 unsigned *PrefixPtr = (unsigned *)Result - 2;
83
84 // Zero out the first 4 bytes; this is used to store the owning module ID.
85 PrefixPtr[0] = 0;
86
87 // Store the global declaration ID in the second 4 bytes.
88 PrefixPtr[1] = ID;
89
90 return Result;
91 }
92
operator new(std::size_t Size,const ASTContext & Ctx,DeclContext * Parent,std::size_t Extra)93 void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
94 DeclContext *Parent, std::size_t Extra) {
95 assert(!Parent || &Parent->getParentASTContext() == &Ctx);
96 // With local visibility enabled, we track the owning module even for local
97 // declarations. We create the TU decl early and may not yet know what the
98 // LangOpts are, so conservatively allocate the storage.
99 if (Ctx.getLangOpts().trackLocalOwningModule() || !Parent) {
100 // Ensure required alignment of the resulting object by adding extra
101 // padding at the start if required.
102 size_t ExtraAlign =
103 llvm::offsetToAlignment(sizeof(Module *), llvm::Align(alignof(Decl)));
104 auto *Buffer = reinterpret_cast<char *>(
105 ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx));
106 Buffer += ExtraAlign;
107 auto *ParentModule =
108 Parent ? cast<Decl>(Parent)->getOwningModule() : nullptr;
109 return new (Buffer) Module*(ParentModule) + 1;
110 }
111 return ::operator new(Size + Extra, Ctx);
112 }
113
getOwningModuleSlow() const114 Module *Decl::getOwningModuleSlow() const {
115 assert(isFromASTFile() && "Not from AST file?");
116 return getASTContext().getExternalSource()->getModule(getOwningModuleID());
117 }
118
hasLocalOwningModuleStorage() const119 bool Decl::hasLocalOwningModuleStorage() const {
120 return getASTContext().getLangOpts().trackLocalOwningModule();
121 }
122
getDeclKindName() const123 const char *Decl::getDeclKindName() const {
124 switch (DeclKind) {
125 default: llvm_unreachable("Declaration not in DeclNodes.inc!");
126 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED;
127 #define ABSTRACT_DECL(DECL)
128 #include "clang/AST/DeclNodes.inc"
129 }
130 }
131
setInvalidDecl(bool Invalid)132 void Decl::setInvalidDecl(bool Invalid) {
133 InvalidDecl = Invalid;
134 assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition());
135 if (!Invalid) {
136 return;
137 }
138
139 if (!isa<ParmVarDecl>(this)) {
140 // Defensive maneuver for ill-formed code: we're likely not to make it to
141 // a point where we set the access specifier, so default it to "public"
142 // to avoid triggering asserts elsewhere in the front end.
143 setAccess(AS_public);
144 }
145
146 // Marking a DecompositionDecl as invalid implies all the child BindingDecl's
147 // are invalid too.
148 if (auto *DD = dyn_cast<DecompositionDecl>(this)) {
149 for (auto *Binding : DD->bindings()) {
150 Binding->setInvalidDecl();
151 }
152 }
153 }
154
getDeclKindName() const155 const char *DeclContext::getDeclKindName() const {
156 switch (getDeclKind()) {
157 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED;
158 #define ABSTRACT_DECL(DECL)
159 #include "clang/AST/DeclNodes.inc"
160 }
161 llvm_unreachable("Declaration context not in DeclNodes.inc!");
162 }
163
164 bool Decl::StatisticsEnabled = false;
EnableStatistics()165 void Decl::EnableStatistics() {
166 StatisticsEnabled = true;
167 }
168
PrintStats()169 void Decl::PrintStats() {
170 llvm::errs() << "\n*** Decl Stats:\n";
171
172 int totalDecls = 0;
173 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s;
174 #define ABSTRACT_DECL(DECL)
175 #include "clang/AST/DeclNodes.inc"
176 llvm::errs() << " " << totalDecls << " decls total.\n";
177
178 int totalBytes = 0;
179 #define DECL(DERIVED, BASE) \
180 if (n##DERIVED##s > 0) { \
181 totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \
182 llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \
183 << sizeof(DERIVED##Decl) << " each (" \
184 << n##DERIVED##s * sizeof(DERIVED##Decl) \
185 << " bytes)\n"; \
186 }
187 #define ABSTRACT_DECL(DECL)
188 #include "clang/AST/DeclNodes.inc"
189
190 llvm::errs() << "Total bytes = " << totalBytes << "\n";
191 }
192
add(Kind k)193 void Decl::add(Kind k) {
194 switch (k) {
195 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break;
196 #define ABSTRACT_DECL(DECL)
197 #include "clang/AST/DeclNodes.inc"
198 }
199 }
200
isTemplateParameterPack() const201 bool Decl::isTemplateParameterPack() const {
202 if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(this))
203 return TTP->isParameterPack();
204 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(this))
205 return NTTP->isParameterPack();
206 if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(this))
207 return TTP->isParameterPack();
208 return false;
209 }
210
isParameterPack() const211 bool Decl::isParameterPack() const {
212 if (const auto *Var = dyn_cast<VarDecl>(this))
213 return Var->isParameterPack();
214
215 return isTemplateParameterPack();
216 }
217
getAsFunction()218 FunctionDecl *Decl::getAsFunction() {
219 if (auto *FD = dyn_cast<FunctionDecl>(this))
220 return FD;
221 if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
222 return FTD->getTemplatedDecl();
223 return nullptr;
224 }
225
isTemplateDecl() const226 bool Decl::isTemplateDecl() const {
227 return isa<TemplateDecl>(this);
228 }
229
getDescribedTemplate() const230 TemplateDecl *Decl::getDescribedTemplate() const {
231 if (auto *FD = dyn_cast<FunctionDecl>(this))
232 return FD->getDescribedFunctionTemplate();
233 if (auto *RD = dyn_cast<CXXRecordDecl>(this))
234 return RD->getDescribedClassTemplate();
235 if (auto *VD = dyn_cast<VarDecl>(this))
236 return VD->getDescribedVarTemplate();
237 if (auto *AD = dyn_cast<TypeAliasDecl>(this))
238 return AD->getDescribedAliasTemplate();
239
240 return nullptr;
241 }
242
getDescribedTemplateParams() const243 const TemplateParameterList *Decl::getDescribedTemplateParams() const {
244 if (auto *TD = getDescribedTemplate())
245 return TD->getTemplateParameters();
246 if (auto *CTPSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(this))
247 return CTPSD->getTemplateParameters();
248 if (auto *VTPSD = dyn_cast<VarTemplatePartialSpecializationDecl>(this))
249 return VTPSD->getTemplateParameters();
250 return nullptr;
251 }
252
isTemplated() const253 bool Decl::isTemplated() const {
254 // A declaration is templated if it is a template or a template pattern, or
255 // is within (lexcially for a friend, semantically otherwise) a dependent
256 // context.
257 // FIXME: Should local extern declarations be treated like friends?
258 if (auto *AsDC = dyn_cast<DeclContext>(this))
259 return AsDC->isDependentContext();
260 auto *DC = getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext();
261 return DC->isDependentContext() || isTemplateDecl() ||
262 getDescribedTemplateParams();
263 }
264
getTemplateDepth() const265 unsigned Decl::getTemplateDepth() const {
266 if (auto *DC = dyn_cast<DeclContext>(this))
267 if (DC->isFileContext())
268 return 0;
269
270 if (auto *TPL = getDescribedTemplateParams())
271 return TPL->getDepth() + 1;
272
273 // If this is a dependent lambda, there might be an enclosing variable
274 // template. In this case, the next step is not the parent DeclContext (or
275 // even a DeclContext at all).
276 auto *RD = dyn_cast<CXXRecordDecl>(this);
277 if (RD && RD->isDependentLambda())
278 if (Decl *Context = RD->getLambdaContextDecl())
279 return Context->getTemplateDepth();
280
281 const DeclContext *DC =
282 getFriendObjectKind() ? getLexicalDeclContext() : getDeclContext();
283 return cast<Decl>(DC)->getTemplateDepth();
284 }
285
getParentFunctionOrMethod() const286 const DeclContext *Decl::getParentFunctionOrMethod() const {
287 for (const DeclContext *DC = getDeclContext();
288 DC && !DC->isTranslationUnit() && !DC->isNamespace();
289 DC = DC->getParent())
290 if (DC->isFunctionOrMethod())
291 return DC;
292
293 return nullptr;
294 }
295
296 //===----------------------------------------------------------------------===//
297 // PrettyStackTraceDecl Implementation
298 //===----------------------------------------------------------------------===//
299
print(raw_ostream & OS) const300 void PrettyStackTraceDecl::print(raw_ostream &OS) const {
301 SourceLocation TheLoc = Loc;
302 if (TheLoc.isInvalid() && TheDecl)
303 TheLoc = TheDecl->getLocation();
304
305 if (TheLoc.isValid()) {
306 TheLoc.print(OS, SM);
307 OS << ": ";
308 }
309
310 OS << Message;
311
312 if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
313 OS << " '";
314 DN->printQualifiedName(OS);
315 OS << '\'';
316 }
317 OS << '\n';
318 }
319
320 //===----------------------------------------------------------------------===//
321 // Decl Implementation
322 //===----------------------------------------------------------------------===//
323
324 // Out-of-line virtual method providing a home for Decl.
325 Decl::~Decl() = default;
326
setDeclContext(DeclContext * DC)327 void Decl::setDeclContext(DeclContext *DC) {
328 DeclCtx = DC;
329 }
330
setLexicalDeclContext(DeclContext * DC)331 void Decl::setLexicalDeclContext(DeclContext *DC) {
332 if (DC == getLexicalDeclContext())
333 return;
334
335 if (isInSemaDC()) {
336 setDeclContextsImpl(getDeclContext(), DC, getASTContext());
337 } else {
338 getMultipleDC()->LexicalDC = DC;
339 }
340
341 // FIXME: We shouldn't be changing the lexical context of declarations
342 // imported from AST files.
343 if (!isFromASTFile()) {
344 setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC));
345 if (hasOwningModule())
346 setLocalOwningModule(cast<Decl>(DC)->getOwningModule());
347 }
348
349 assert(
350 (getModuleOwnershipKind() != ModuleOwnershipKind::VisibleWhenImported ||
351 getOwningModule()) &&
352 "hidden declaration has no owning module");
353 }
354
setDeclContextsImpl(DeclContext * SemaDC,DeclContext * LexicalDC,ASTContext & Ctx)355 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
356 ASTContext &Ctx) {
357 if (SemaDC == LexicalDC) {
358 DeclCtx = SemaDC;
359 } else {
360 auto *MDC = new (Ctx) Decl::MultipleDC();
361 MDC->SemanticDC = SemaDC;
362 MDC->LexicalDC = LexicalDC;
363 DeclCtx = MDC;
364 }
365 }
366
isInLocalScopeForInstantiation() const367 bool Decl::isInLocalScopeForInstantiation() const {
368 const DeclContext *LDC = getLexicalDeclContext();
369 if (!LDC->isDependentContext())
370 return false;
371 while (true) {
372 if (LDC->isFunctionOrMethod())
373 return true;
374 if (!isa<TagDecl>(LDC))
375 return false;
376 if (const auto *CRD = dyn_cast<CXXRecordDecl>(LDC))
377 if (CRD->isLambda())
378 return true;
379 LDC = LDC->getLexicalParent();
380 }
381 return false;
382 }
383
isInAnonymousNamespace() const384 bool Decl::isInAnonymousNamespace() const {
385 for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) {
386 if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
387 if (ND->isAnonymousNamespace())
388 return true;
389 }
390
391 return false;
392 }
393
isInStdNamespace() const394 bool Decl::isInStdNamespace() const {
395 const DeclContext *DC = getDeclContext();
396 return DC && DC->isStdNamespace();
397 }
398
getTranslationUnitDecl()399 TranslationUnitDecl *Decl::getTranslationUnitDecl() {
400 if (auto *TUD = dyn_cast<TranslationUnitDecl>(this))
401 return TUD;
402
403 DeclContext *DC = getDeclContext();
404 assert(DC && "This decl is not contained in a translation unit!");
405
406 while (!DC->isTranslationUnit()) {
407 DC = DC->getParent();
408 assert(DC && "This decl is not contained in a translation unit!");
409 }
410
411 return cast<TranslationUnitDecl>(DC);
412 }
413
getASTContext() const414 ASTContext &Decl::getASTContext() const {
415 return getTranslationUnitDecl()->getASTContext();
416 }
417
418 /// Helper to get the language options from the ASTContext.
419 /// Defined out of line to avoid depending on ASTContext.h.
getLangOpts() const420 const LangOptions &Decl::getLangOpts() const {
421 return getASTContext().getLangOpts();
422 }
423
getASTMutationListener() const424 ASTMutationListener *Decl::getASTMutationListener() const {
425 return getASTContext().getASTMutationListener();
426 }
427
getMaxAlignment() const428 unsigned Decl::getMaxAlignment() const {
429 if (!hasAttrs())
430 return 0;
431
432 unsigned Align = 0;
433 const AttrVec &V = getAttrs();
434 ASTContext &Ctx = getASTContext();
435 specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
436 for (; I != E; ++I) {
437 if (!I->isAlignmentErrorDependent())
438 Align = std::max(Align, I->getAlignment(Ctx));
439 }
440 return Align;
441 }
442
isUsed(bool CheckUsedAttr) const443 bool Decl::isUsed(bool CheckUsedAttr) const {
444 const Decl *CanonD = getCanonicalDecl();
445 if (CanonD->Used)
446 return true;
447
448 // Check for used attribute.
449 // Ask the most recent decl, since attributes accumulate in the redecl chain.
450 if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>())
451 return true;
452
453 // The information may have not been deserialized yet. Force deserialization
454 // to complete the needed information.
455 return getMostRecentDecl()->getCanonicalDecl()->Used;
456 }
457
markUsed(ASTContext & C)458 void Decl::markUsed(ASTContext &C) {
459 if (isUsed(false))
460 return;
461
462 if (C.getASTMutationListener())
463 C.getASTMutationListener()->DeclarationMarkedUsed(this);
464
465 setIsUsed();
466 }
467
isReferenced() const468 bool Decl::isReferenced() const {
469 if (Referenced)
470 return true;
471
472 // Check redeclarations.
473 for (const auto *I : redecls())
474 if (I->Referenced)
475 return true;
476
477 return false;
478 }
479
getExternalSourceSymbolAttr() const480 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
481 const Decl *Definition = nullptr;
482 if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) {
483 Definition = ID->getDefinition();
484 } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) {
485 Definition = PD->getDefinition();
486 } else if (auto *TD = dyn_cast<TagDecl>(this)) {
487 Definition = TD->getDefinition();
488 }
489 if (!Definition)
490 Definition = this;
491
492 if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
493 return attr;
494 if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
495 return dcd->getAttr<ExternalSourceSymbolAttr>();
496 }
497
498 return nullptr;
499 }
500
hasDefiningAttr() const501 bool Decl::hasDefiningAttr() const {
502 return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>() ||
503 hasAttr<LoaderUninitializedAttr>();
504 }
505
getDefiningAttr() const506 const Attr *Decl::getDefiningAttr() const {
507 if (auto *AA = getAttr<AliasAttr>())
508 return AA;
509 if (auto *IFA = getAttr<IFuncAttr>())
510 return IFA;
511 if (auto *NZA = getAttr<LoaderUninitializedAttr>())
512 return NZA;
513 return nullptr;
514 }
515
getRealizedPlatform(const AvailabilityAttr * A,const ASTContext & Context)516 static StringRef getRealizedPlatform(const AvailabilityAttr *A,
517 const ASTContext &Context) {
518 // Check if this is an App Extension "platform", and if so chop off
519 // the suffix for matching with the actual platform.
520 StringRef RealizedPlatform = A->getPlatform()->getName();
521 if (!Context.getLangOpts().AppExt)
522 return RealizedPlatform;
523 size_t suffix = RealizedPlatform.rfind("_app_extension");
524 if (suffix != StringRef::npos)
525 return RealizedPlatform.slice(0, suffix);
526 return RealizedPlatform;
527 }
528
529 /// Determine the availability of the given declaration based on
530 /// the target platform.
531 ///
532 /// When it returns an availability result other than \c AR_Available,
533 /// if the \p Message parameter is non-NULL, it will be set to a
534 /// string describing why the entity is unavailable.
535 ///
536 /// FIXME: Make these strings localizable, since they end up in
537 /// diagnostics.
CheckAvailability(ASTContext & Context,const AvailabilityAttr * A,std::string * Message,VersionTuple EnclosingVersion)538 static AvailabilityResult CheckAvailability(ASTContext &Context,
539 const AvailabilityAttr *A,
540 std::string *Message,
541 VersionTuple EnclosingVersion) {
542 if (EnclosingVersion.empty())
543 EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion();
544
545 if (EnclosingVersion.empty())
546 return AR_Available;
547
548 StringRef ActualPlatform = A->getPlatform()->getName();
549 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
550
551 // Match the platform name.
552 if (getRealizedPlatform(A, Context) != TargetPlatform)
553 return AR_Available;
554
555 StringRef PrettyPlatformName
556 = AvailabilityAttr::getPrettyPlatformName(ActualPlatform);
557
558 if (PrettyPlatformName.empty())
559 PrettyPlatformName = ActualPlatform;
560
561 std::string HintMessage;
562 if (!A->getMessage().empty()) {
563 HintMessage = " - ";
564 HintMessage += A->getMessage();
565 }
566
567 // Make sure that this declaration has not been marked 'unavailable'.
568 if (A->getUnavailable()) {
569 if (Message) {
570 Message->clear();
571 llvm::raw_string_ostream Out(*Message);
572 Out << "not available on " << PrettyPlatformName
573 << HintMessage;
574 }
575
576 return AR_Unavailable;
577 }
578
579 // Make sure that this declaration has already been introduced.
580 if (!A->getIntroduced().empty() &&
581 EnclosingVersion < A->getIntroduced()) {
582 if (Message) {
583 Message->clear();
584 llvm::raw_string_ostream Out(*Message);
585 VersionTuple VTI(A->getIntroduced());
586 Out << "introduced in " << PrettyPlatformName << ' '
587 << VTI << HintMessage;
588 }
589
590 return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced;
591 }
592
593 // Make sure that this declaration hasn't been obsoleted.
594 if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) {
595 if (Message) {
596 Message->clear();
597 llvm::raw_string_ostream Out(*Message);
598 VersionTuple VTO(A->getObsoleted());
599 Out << "obsoleted in " << PrettyPlatformName << ' '
600 << VTO << HintMessage;
601 }
602
603 return AR_Unavailable;
604 }
605
606 // Make sure that this declaration hasn't been deprecated.
607 if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) {
608 if (Message) {
609 Message->clear();
610 llvm::raw_string_ostream Out(*Message);
611 VersionTuple VTD(A->getDeprecated());
612 Out << "first deprecated in " << PrettyPlatformName << ' '
613 << VTD << HintMessage;
614 }
615
616 return AR_Deprecated;
617 }
618
619 return AR_Available;
620 }
621
getAvailability(std::string * Message,VersionTuple EnclosingVersion,StringRef * RealizedPlatform) const622 AvailabilityResult Decl::getAvailability(std::string *Message,
623 VersionTuple EnclosingVersion,
624 StringRef *RealizedPlatform) const {
625 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
626 return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion,
627 RealizedPlatform);
628
629 AvailabilityResult Result = AR_Available;
630 std::string ResultMessage;
631
632 for (const auto *A : attrs()) {
633 if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) {
634 if (Result >= AR_Deprecated)
635 continue;
636
637 if (Message)
638 ResultMessage = std::string(Deprecated->getMessage());
639
640 Result = AR_Deprecated;
641 continue;
642 }
643
644 if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) {
645 if (Message)
646 *Message = std::string(Unavailable->getMessage());
647 return AR_Unavailable;
648 }
649
650 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
651 AvailabilityResult AR = CheckAvailability(getASTContext(), Availability,
652 Message, EnclosingVersion);
653
654 if (AR == AR_Unavailable) {
655 if (RealizedPlatform)
656 *RealizedPlatform = Availability->getPlatform()->getName();
657 return AR_Unavailable;
658 }
659
660 if (AR > Result) {
661 Result = AR;
662 if (Message)
663 ResultMessage.swap(*Message);
664 }
665 continue;
666 }
667 }
668
669 if (Message)
670 Message->swap(ResultMessage);
671 return Result;
672 }
673
getVersionIntroduced() const674 VersionTuple Decl::getVersionIntroduced() const {
675 const ASTContext &Context = getASTContext();
676 StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
677 for (const auto *A : attrs()) {
678 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
679 if (getRealizedPlatform(Availability, Context) != TargetPlatform)
680 continue;
681 if (!Availability->getIntroduced().empty())
682 return Availability->getIntroduced();
683 }
684 }
685 return {};
686 }
687
canBeWeakImported(bool & IsDefinition) const688 bool Decl::canBeWeakImported(bool &IsDefinition) const {
689 IsDefinition = false;
690
691 // Variables, if they aren't definitions.
692 if (const auto *Var = dyn_cast<VarDecl>(this)) {
693 if (Var->isThisDeclarationADefinition()) {
694 IsDefinition = true;
695 return false;
696 }
697 return true;
698 }
699 // Functions, if they aren't definitions.
700 if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
701 if (FD->hasBody()) {
702 IsDefinition = true;
703 return false;
704 }
705 return true;
706
707 }
708 // Objective-C classes, if this is the non-fragile runtime.
709 if (isa<ObjCInterfaceDecl>(this) &&
710 getASTContext().getLangOpts().ObjCRuntime.hasWeakClassImport()) {
711 return true;
712 }
713 // Nothing else.
714 return false;
715 }
716
isWeakImported() const717 bool Decl::isWeakImported() const {
718 bool IsDefinition;
719 if (!canBeWeakImported(IsDefinition))
720 return false;
721
722 for (const auto *A : getMostRecentDecl()->attrs()) {
723 if (isa<WeakImportAttr>(A))
724 return true;
725
726 if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
727 if (CheckAvailability(getASTContext(), Availability, nullptr,
728 VersionTuple()) == AR_NotYetIntroduced)
729 return true;
730 }
731 }
732
733 return false;
734 }
735
getIdentifierNamespaceForKind(Kind DeclKind)736 unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
737 switch (DeclKind) {
738 case Function:
739 case CXXDeductionGuide:
740 case CXXMethod:
741 case CXXConstructor:
742 case ConstructorUsingShadow:
743 case CXXDestructor:
744 case CXXConversion:
745 case EnumConstant:
746 case Var:
747 case ImplicitParam:
748 case ParmVar:
749 case ObjCMethod:
750 case ObjCProperty:
751 case MSProperty:
752 return IDNS_Ordinary;
753 case Label:
754 return IDNS_Label;
755 case IndirectField:
756 return IDNS_Ordinary | IDNS_Member;
757
758 case Binding:
759 case NonTypeTemplateParm:
760 case VarTemplate:
761 case Concept:
762 // These (C++-only) declarations are found by redeclaration lookup for
763 // tag types, so we include them in the tag namespace.
764 return IDNS_Ordinary | IDNS_Tag;
765
766 case ObjCCompatibleAlias:
767 case ObjCInterface:
768 return IDNS_Ordinary | IDNS_Type;
769
770 case Typedef:
771 case TypeAlias:
772 case TemplateTypeParm:
773 case ObjCTypeParam:
774 return IDNS_Ordinary | IDNS_Type;
775
776 case UnresolvedUsingTypename:
777 return IDNS_Ordinary | IDNS_Type | IDNS_Using;
778
779 case UsingShadow:
780 return 0; // we'll actually overwrite this later
781
782 case UnresolvedUsingValue:
783 return IDNS_Ordinary | IDNS_Using;
784
785 case Using:
786 case UsingPack:
787 return IDNS_Using;
788
789 case ObjCProtocol:
790 return IDNS_ObjCProtocol;
791
792 case Field:
793 case ObjCAtDefsField:
794 case ObjCIvar:
795 return IDNS_Member;
796
797 case Record:
798 case CXXRecord:
799 case Enum:
800 return IDNS_Tag | IDNS_Type;
801
802 case Namespace:
803 case NamespaceAlias:
804 return IDNS_Namespace;
805
806 case FunctionTemplate:
807 return IDNS_Ordinary;
808
809 case ClassTemplate:
810 case TemplateTemplateParm:
811 case TypeAliasTemplate:
812 return IDNS_Ordinary | IDNS_Tag | IDNS_Type;
813
814 case OMPDeclareReduction:
815 return IDNS_OMPReduction;
816
817 case OMPDeclareMapper:
818 return IDNS_OMPMapper;
819
820 // Never have names.
821 case Friend:
822 case FriendTemplate:
823 case AccessSpec:
824 case LinkageSpec:
825 case Export:
826 case FileScopeAsm:
827 case StaticAssert:
828 case ObjCPropertyImpl:
829 case PragmaComment:
830 case PragmaDetectMismatch:
831 case Block:
832 case Captured:
833 case TranslationUnit:
834 case ExternCContext:
835 case Decomposition:
836 case MSGuid:
837 case TemplateParamObject:
838
839 case UsingDirective:
840 case BuiltinTemplate:
841 case ClassTemplateSpecialization:
842 case ClassTemplatePartialSpecialization:
843 case ClassScopeFunctionSpecialization:
844 case VarTemplateSpecialization:
845 case VarTemplatePartialSpecialization:
846 case ObjCImplementation:
847 case ObjCCategory:
848 case ObjCCategoryImpl:
849 case Import:
850 case OMPThreadPrivate:
851 case OMPAllocate:
852 case OMPRequires:
853 case OMPCapturedExpr:
854 case Empty:
855 case LifetimeExtendedTemporary:
856 case RequiresExprBody:
857 // Never looked up by name.
858 return 0;
859 }
860
861 llvm_unreachable("Invalid DeclKind!");
862 }
863
setAttrsImpl(const AttrVec & attrs,ASTContext & Ctx)864 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) {
865 assert(!HasAttrs && "Decl already contains attrs.");
866
867 AttrVec &AttrBlank = Ctx.getDeclAttrs(this);
868 assert(AttrBlank.empty() && "HasAttrs was wrong?");
869
870 AttrBlank = attrs;
871 HasAttrs = true;
872 }
873
dropAttrs()874 void Decl::dropAttrs() {
875 if (!HasAttrs) return;
876
877 HasAttrs = false;
878 getASTContext().eraseDeclAttrs(this);
879 }
880
addAttr(Attr * A)881 void Decl::addAttr(Attr *A) {
882 if (!hasAttrs()) {
883 setAttrs(AttrVec(1, A));
884 return;
885 }
886
887 AttrVec &Attrs = getAttrs();
888 if (!A->isInherited()) {
889 Attrs.push_back(A);
890 return;
891 }
892
893 // Attribute inheritance is processed after attribute parsing. To keep the
894 // order as in the source code, add inherited attributes before non-inherited
895 // ones.
896 auto I = Attrs.begin(), E = Attrs.end();
897 for (; I != E; ++I) {
898 if (!(*I)->isInherited())
899 break;
900 }
901 Attrs.insert(I, A);
902 }
903
getAttrs() const904 const AttrVec &Decl::getAttrs() const {
905 assert(HasAttrs && "No attrs to get!");
906 return getASTContext().getDeclAttrs(this);
907 }
908
castFromDeclContext(const DeclContext * D)909 Decl *Decl::castFromDeclContext (const DeclContext *D) {
910 Decl::Kind DK = D->getDeclKind();
911 switch(DK) {
912 #define DECL(NAME, BASE)
913 #define DECL_CONTEXT(NAME) \
914 case Decl::NAME: \
915 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
916 #define DECL_CONTEXT_BASE(NAME)
917 #include "clang/AST/DeclNodes.inc"
918 default:
919 #define DECL(NAME, BASE)
920 #define DECL_CONTEXT_BASE(NAME) \
921 if (DK >= first##NAME && DK <= last##NAME) \
922 return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
923 #include "clang/AST/DeclNodes.inc"
924 llvm_unreachable("a decl that inherits DeclContext isn't handled");
925 }
926 }
927
castToDeclContext(const Decl * D)928 DeclContext *Decl::castToDeclContext(const Decl *D) {
929 Decl::Kind DK = D->getKind();
930 switch(DK) {
931 #define DECL(NAME, BASE)
932 #define DECL_CONTEXT(NAME) \
933 case Decl::NAME: \
934 return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
935 #define DECL_CONTEXT_BASE(NAME)
936 #include "clang/AST/DeclNodes.inc"
937 default:
938 #define DECL(NAME, BASE)
939 #define DECL_CONTEXT_BASE(NAME) \
940 if (DK >= first##NAME && DK <= last##NAME) \
941 return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
942 #include "clang/AST/DeclNodes.inc"
943 llvm_unreachable("a decl that inherits DeclContext isn't handled");
944 }
945 }
946
getBodyRBrace() const947 SourceLocation Decl::getBodyRBrace() const {
948 // Special handling of FunctionDecl to avoid de-serializing the body from PCH.
949 // FunctionDecl stores EndRangeLoc for this purpose.
950 if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
951 const FunctionDecl *Definition;
952 if (FD->hasBody(Definition))
953 return Definition->getSourceRange().getEnd();
954 return {};
955 }
956
957 if (Stmt *Body = getBody())
958 return Body->getSourceRange().getEnd();
959
960 return {};
961 }
962
AccessDeclContextSanity() const963 bool Decl::AccessDeclContextSanity() const {
964 #ifndef NDEBUG
965 // Suppress this check if any of the following hold:
966 // 1. this is the translation unit (and thus has no parent)
967 // 2. this is a template parameter (and thus doesn't belong to its context)
968 // 3. this is a non-type template parameter
969 // 4. the context is not a record
970 // 5. it's invalid
971 // 6. it's a C++0x static_assert.
972 // 7. it's a block literal declaration
973 // 8. it's a temporary with lifetime extended due to being default value.
974 if (isa<TranslationUnitDecl>(this) || isa<TemplateTypeParmDecl>(this) ||
975 isa<NonTypeTemplateParmDecl>(this) || !getDeclContext() ||
976 !isa<CXXRecordDecl>(getDeclContext()) || isInvalidDecl() ||
977 isa<StaticAssertDecl>(this) || isa<BlockDecl>(this) ||
978 // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
979 // as DeclContext (?).
980 isa<ParmVarDecl>(this) ||
981 // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
982 // AS_none as access specifier.
983 isa<CXXRecordDecl>(this) ||
984 isa<ClassScopeFunctionSpecializationDecl>(this) ||
985 isa<LifetimeExtendedTemporaryDecl>(this))
986 return true;
987
988 assert(Access != AS_none &&
989 "Access specifier is AS_none inside a record decl");
990 #endif
991 return true;
992 }
993
getKind(const Decl * D)994 static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
getKind(const DeclContext * DC)995 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }
996
getID() const997 int64_t Decl::getID() const {
998 return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this);
999 }
1000
getFunctionType(bool BlocksToo) const1001 const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
1002 QualType Ty;
1003 if (const auto *D = dyn_cast<ValueDecl>(this))
1004 Ty = D->getType();
1005 else if (const auto *D = dyn_cast<TypedefNameDecl>(this))
1006 Ty = D->getUnderlyingType();
1007 else
1008 return nullptr;
1009
1010 if (Ty->isFunctionPointerType())
1011 Ty = Ty->castAs<PointerType>()->getPointeeType();
1012 else if (Ty->isFunctionReferenceType())
1013 Ty = Ty->castAs<ReferenceType>()->getPointeeType();
1014 else if (BlocksToo && Ty->isBlockPointerType())
1015 Ty = Ty->castAs<BlockPointerType>()->getPointeeType();
1016
1017 return Ty->getAs<FunctionType>();
1018 }
1019
1020 /// Starting at a given context (a Decl or DeclContext), look for a
1021 /// code context that is not a closure (a lambda, block, etc.).
getNonClosureContext(T * D)1022 template <class T> static Decl *getNonClosureContext(T *D) {
1023 if (getKind(D) == Decl::CXXMethod) {
1024 auto *MD = cast<CXXMethodDecl>(D);
1025 if (MD->getOverloadedOperator() == OO_Call &&
1026 MD->getParent()->isLambda())
1027 return getNonClosureContext(MD->getParent()->getParent());
1028 return MD;
1029 }
1030 if (auto *FD = dyn_cast<FunctionDecl>(D))
1031 return FD;
1032 if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
1033 return MD;
1034 if (auto *BD = dyn_cast<BlockDecl>(D))
1035 return getNonClosureContext(BD->getParent());
1036 if (auto *CD = dyn_cast<CapturedDecl>(D))
1037 return getNonClosureContext(CD->getParent());
1038 return nullptr;
1039 }
1040
getNonClosureContext()1041 Decl *Decl::getNonClosureContext() {
1042 return ::getNonClosureContext(this);
1043 }
1044
getNonClosureAncestor()1045 Decl *DeclContext::getNonClosureAncestor() {
1046 return ::getNonClosureContext(this);
1047 }
1048
1049 //===----------------------------------------------------------------------===//
1050 // DeclContext Implementation
1051 //===----------------------------------------------------------------------===//
1052
DeclContext(Decl::Kind K)1053 DeclContext::DeclContext(Decl::Kind K) {
1054 DeclContextBits.DeclKind = K;
1055 setHasExternalLexicalStorage(false);
1056 setHasExternalVisibleStorage(false);
1057 setNeedToReconcileExternalVisibleStorage(false);
1058 setHasLazyLocalLexicalLookups(false);
1059 setHasLazyExternalLexicalLookups(false);
1060 setUseQualifiedLookup(false);
1061 }
1062
classof(const Decl * D)1063 bool DeclContext::classof(const Decl *D) {
1064 switch (D->getKind()) {
1065 #define DECL(NAME, BASE)
1066 #define DECL_CONTEXT(NAME) case Decl::NAME:
1067 #define DECL_CONTEXT_BASE(NAME)
1068 #include "clang/AST/DeclNodes.inc"
1069 return true;
1070 default:
1071 #define DECL(NAME, BASE)
1072 #define DECL_CONTEXT_BASE(NAME) \
1073 if (D->getKind() >= Decl::first##NAME && \
1074 D->getKind() <= Decl::last##NAME) \
1075 return true;
1076 #include "clang/AST/DeclNodes.inc"
1077 return false;
1078 }
1079 }
1080
1081 DeclContext::~DeclContext() = default;
1082
1083 /// Find the parent context of this context that will be
1084 /// used for unqualified name lookup.
1085 ///
1086 /// Generally, the parent lookup context is the semantic context. However, for
1087 /// a friend function the parent lookup context is the lexical context, which
1088 /// is the class in which the friend is declared.
getLookupParent()1089 DeclContext *DeclContext::getLookupParent() {
1090 // FIXME: Find a better way to identify friends.
1091 if (isa<FunctionDecl>(this))
1092 if (getParent()->getRedeclContext()->isFileContext() &&
1093 getLexicalParent()->getRedeclContext()->isRecord())
1094 return getLexicalParent();
1095
1096 // A lookup within the call operator of a lambda never looks in the lambda
1097 // class; instead, skip to the context in which that closure type is
1098 // declared.
1099 if (isLambdaCallOperator(this))
1100 return getParent()->getParent();
1101
1102 return getParent();
1103 }
1104
getInnermostBlockDecl() const1105 const BlockDecl *DeclContext::getInnermostBlockDecl() const {
1106 const DeclContext *Ctx = this;
1107
1108 do {
1109 if (Ctx->isClosure())
1110 return cast<BlockDecl>(Ctx);
1111 Ctx = Ctx->getParent();
1112 } while (Ctx);
1113
1114 return nullptr;
1115 }
1116
isInlineNamespace() const1117 bool DeclContext::isInlineNamespace() const {
1118 return isNamespace() &&
1119 cast<NamespaceDecl>(this)->isInline();
1120 }
1121
isStdNamespace() const1122 bool DeclContext::isStdNamespace() const {
1123 if (!isNamespace())
1124 return false;
1125
1126 const auto *ND = cast<NamespaceDecl>(this);
1127 if (ND->isInline()) {
1128 return ND->getParent()->isStdNamespace();
1129 }
1130
1131 if (!getParent()->getRedeclContext()->isTranslationUnit())
1132 return false;
1133
1134 const IdentifierInfo *II = ND->getIdentifier();
1135 return II && II->isStr("std");
1136 }
1137
isDependentContext() const1138 bool DeclContext::isDependentContext() const {
1139 if (isFileContext())
1140 return false;
1141
1142 if (isa<ClassTemplatePartialSpecializationDecl>(this))
1143 return true;
1144
1145 if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) {
1146 if (Record->getDescribedClassTemplate())
1147 return true;
1148
1149 if (Record->isDependentLambda())
1150 return true;
1151 }
1152
1153 if (const auto *Function = dyn_cast<FunctionDecl>(this)) {
1154 if (Function->getDescribedFunctionTemplate())
1155 return true;
1156
1157 // Friend function declarations are dependent if their *lexical*
1158 // context is dependent.
1159 if (cast<Decl>(this)->getFriendObjectKind())
1160 return getLexicalParent()->isDependentContext();
1161 }
1162
1163 // FIXME: A variable template is a dependent context, but is not a
1164 // DeclContext. A context within it (such as a lambda-expression)
1165 // should be considered dependent.
1166
1167 return getParent() && getParent()->isDependentContext();
1168 }
1169
isTransparentContext() const1170 bool DeclContext::isTransparentContext() const {
1171 if (getDeclKind() == Decl::Enum)
1172 return !cast<EnumDecl>(this)->isScoped();
1173
1174 return getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export;
1175 }
1176
isLinkageSpecContext(const DeclContext * DC,LinkageSpecDecl::LanguageIDs ID)1177 static bool isLinkageSpecContext(const DeclContext *DC,
1178 LinkageSpecDecl::LanguageIDs ID) {
1179 while (DC->getDeclKind() != Decl::TranslationUnit) {
1180 if (DC->getDeclKind() == Decl::LinkageSpec)
1181 return cast<LinkageSpecDecl>(DC)->getLanguage() == ID;
1182 DC = DC->getLexicalParent();
1183 }
1184 return false;
1185 }
1186
isExternCContext() const1187 bool DeclContext::isExternCContext() const {
1188 return isLinkageSpecContext(this, LinkageSpecDecl::lang_c);
1189 }
1190
getExternCContext() const1191 const LinkageSpecDecl *DeclContext::getExternCContext() const {
1192 const DeclContext *DC = this;
1193 while (DC->getDeclKind() != Decl::TranslationUnit) {
1194 if (DC->getDeclKind() == Decl::LinkageSpec &&
1195 cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c)
1196 return cast<LinkageSpecDecl>(DC);
1197 DC = DC->getLexicalParent();
1198 }
1199 return nullptr;
1200 }
1201
isExternCXXContext() const1202 bool DeclContext::isExternCXXContext() const {
1203 return isLinkageSpecContext(this, LinkageSpecDecl::lang_cxx);
1204 }
1205
Encloses(const DeclContext * DC) const1206 bool DeclContext::Encloses(const DeclContext *DC) const {
1207 if (getPrimaryContext() != this)
1208 return getPrimaryContext()->Encloses(DC);
1209
1210 for (; DC; DC = DC->getParent())
1211 if (DC->getPrimaryContext() == this)
1212 return true;
1213 return false;
1214 }
1215
getPrimaryContext()1216 DeclContext *DeclContext::getPrimaryContext() {
1217 switch (getDeclKind()) {
1218 case Decl::TranslationUnit:
1219 case Decl::ExternCContext:
1220 case Decl::LinkageSpec:
1221 case Decl::Export:
1222 case Decl::Block:
1223 case Decl::Captured:
1224 case Decl::OMPDeclareReduction:
1225 case Decl::OMPDeclareMapper:
1226 case Decl::RequiresExprBody:
1227 // There is only one DeclContext for these entities.
1228 return this;
1229
1230 case Decl::Namespace:
1231 // The original namespace is our primary context.
1232 return static_cast<NamespaceDecl *>(this)->getOriginalNamespace();
1233
1234 case Decl::ObjCMethod:
1235 return this;
1236
1237 case Decl::ObjCInterface:
1238 if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this))
1239 if (auto *Def = OID->getDefinition())
1240 return Def;
1241 return this;
1242
1243 case Decl::ObjCProtocol:
1244 if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this))
1245 if (auto *Def = OPD->getDefinition())
1246 return Def;
1247 return this;
1248
1249 case Decl::ObjCCategory:
1250 return this;
1251
1252 case Decl::ObjCImplementation:
1253 case Decl::ObjCCategoryImpl:
1254 return this;
1255
1256 default:
1257 if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) {
1258 // If this is a tag type that has a definition or is currently
1259 // being defined, that definition is our primary context.
1260 auto *Tag = cast<TagDecl>(this);
1261
1262 if (TagDecl *Def = Tag->getDefinition())
1263 return Def;
1264
1265 if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) {
1266 // Note, TagType::getDecl returns the (partial) definition one exists.
1267 TagDecl *PossiblePartialDef = TagTy->getDecl();
1268 if (PossiblePartialDef->isBeingDefined())
1269 return PossiblePartialDef;
1270 } else {
1271 assert(isa<InjectedClassNameType>(Tag->getTypeForDecl()));
1272 }
1273
1274 return Tag;
1275 }
1276
1277 assert(getDeclKind() >= Decl::firstFunction &&
1278 getDeclKind() <= Decl::lastFunction &&
1279 "Unknown DeclContext kind");
1280 return this;
1281 }
1282 }
1283
1284 void
collectAllContexts(SmallVectorImpl<DeclContext * > & Contexts)1285 DeclContext::collectAllContexts(SmallVectorImpl<DeclContext *> &Contexts){
1286 Contexts.clear();
1287
1288 if (getDeclKind() != Decl::Namespace) {
1289 Contexts.push_back(this);
1290 return;
1291 }
1292
1293 auto *Self = static_cast<NamespaceDecl *>(this);
1294 for (NamespaceDecl *N = Self->getMostRecentDecl(); N;
1295 N = N->getPreviousDecl())
1296 Contexts.push_back(N);
1297
1298 std::reverse(Contexts.begin(), Contexts.end());
1299 }
1300
1301 std::pair<Decl *, Decl *>
BuildDeclChain(ArrayRef<Decl * > Decls,bool FieldsAlreadyLoaded)1302 DeclContext::BuildDeclChain(ArrayRef<Decl *> Decls,
1303 bool FieldsAlreadyLoaded) {
1304 // Build up a chain of declarations via the Decl::NextInContextAndBits field.
1305 Decl *FirstNewDecl = nullptr;
1306 Decl *PrevDecl = nullptr;
1307 for (auto *D : Decls) {
1308 if (FieldsAlreadyLoaded && isa<FieldDecl>(D))
1309 continue;
1310
1311 if (PrevDecl)
1312 PrevDecl->NextInContextAndBits.setPointer(D);
1313 else
1314 FirstNewDecl = D;
1315
1316 PrevDecl = D;
1317 }
1318
1319 return std::make_pair(FirstNewDecl, PrevDecl);
1320 }
1321
1322 /// We have just acquired external visible storage, and we already have
1323 /// built a lookup map. For every name in the map, pull in the new names from
1324 /// the external storage.
reconcileExternalVisibleStorage() const1325 void DeclContext::reconcileExternalVisibleStorage() const {
1326 assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr);
1327 setNeedToReconcileExternalVisibleStorage(false);
1328
1329 for (auto &Lookup : *LookupPtr)
1330 Lookup.second.setHasExternalDecls();
1331 }
1332
1333 /// Load the declarations within this lexical storage from an
1334 /// external source.
1335 /// \return \c true if any declarations were added.
1336 bool
LoadLexicalDeclsFromExternalStorage() const1337 DeclContext::LoadLexicalDeclsFromExternalStorage() const {
1338 ExternalASTSource *Source = getParentASTContext().getExternalSource();
1339 assert(hasExternalLexicalStorage() && Source && "No external storage?");
1340
1341 // Notify that we have a DeclContext that is initializing.
1342 ExternalASTSource::Deserializing ADeclContext(Source);
1343
1344 // Load the external declarations, if any.
1345 SmallVector<Decl*, 64> Decls;
1346 setHasExternalLexicalStorage(false);
1347 Source->FindExternalLexicalDecls(this, Decls);
1348
1349 if (Decls.empty())
1350 return false;
1351
1352 // We may have already loaded just the fields of this record, in which case
1353 // we need to ignore them.
1354 bool FieldsAlreadyLoaded = false;
1355 if (const auto *RD = dyn_cast<RecordDecl>(this))
1356 FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage();
1357
1358 // Splice the newly-read declarations into the beginning of the list
1359 // of declarations.
1360 Decl *ExternalFirst, *ExternalLast;
1361 std::tie(ExternalFirst, ExternalLast) =
1362 BuildDeclChain(Decls, FieldsAlreadyLoaded);
1363 ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
1364 FirstDecl = ExternalFirst;
1365 if (!LastDecl)
1366 LastDecl = ExternalLast;
1367 return true;
1368 }
1369
1370 DeclContext::lookup_result
SetNoExternalVisibleDeclsForName(const DeclContext * DC,DeclarationName Name)1371 ExternalASTSource::SetNoExternalVisibleDeclsForName(const DeclContext *DC,
1372 DeclarationName Name) {
1373 ASTContext &Context = DC->getParentASTContext();
1374 StoredDeclsMap *Map;
1375 if (!(Map = DC->LookupPtr))
1376 Map = DC->CreateStoredDeclsMap(Context);
1377 if (DC->hasNeedToReconcileExternalVisibleStorage())
1378 DC->reconcileExternalVisibleStorage();
1379
1380 (*Map)[Name].removeExternalDecls();
1381
1382 return DeclContext::lookup_result();
1383 }
1384
1385 DeclContext::lookup_result
SetExternalVisibleDeclsForName(const DeclContext * DC,DeclarationName Name,ArrayRef<NamedDecl * > Decls)1386 ExternalASTSource::SetExternalVisibleDeclsForName(const DeclContext *DC,
1387 DeclarationName Name,
1388 ArrayRef<NamedDecl*> Decls) {
1389 ASTContext &Context = DC->getParentASTContext();
1390 StoredDeclsMap *Map;
1391 if (!(Map = DC->LookupPtr))
1392 Map = DC->CreateStoredDeclsMap(Context);
1393 if (DC->hasNeedToReconcileExternalVisibleStorage())
1394 DC->reconcileExternalVisibleStorage();
1395
1396 StoredDeclsList &List = (*Map)[Name];
1397 List.replaceExternalDecls(Decls);
1398 return List.getLookupResult();
1399 }
1400
decls_begin() const1401 DeclContext::decl_iterator DeclContext::decls_begin() const {
1402 if (hasExternalLexicalStorage())
1403 LoadLexicalDeclsFromExternalStorage();
1404 return decl_iterator(FirstDecl);
1405 }
1406
decls_empty() const1407 bool DeclContext::decls_empty() const {
1408 if (hasExternalLexicalStorage())
1409 LoadLexicalDeclsFromExternalStorage();
1410
1411 return !FirstDecl;
1412 }
1413
containsDecl(Decl * D) const1414 bool DeclContext::containsDecl(Decl *D) const {
1415 return (D->getLexicalDeclContext() == this &&
1416 (D->NextInContextAndBits.getPointer() || D == LastDecl));
1417 }
1418
containsDeclAndLoad(Decl * D) const1419 bool DeclContext::containsDeclAndLoad(Decl *D) const {
1420 if (hasExternalLexicalStorage())
1421 LoadLexicalDeclsFromExternalStorage();
1422 return containsDecl(D);
1423 }
1424
1425 /// shouldBeHidden - Determine whether a declaration which was declared
1426 /// within its semantic context should be invisible to qualified name lookup.
shouldBeHidden(NamedDecl * D)1427 static bool shouldBeHidden(NamedDecl *D) {
1428 // Skip unnamed declarations.
1429 if (!D->getDeclName())
1430 return true;
1431
1432 // Skip entities that can't be found by name lookup into a particular
1433 // context.
1434 if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) ||
1435 D->isTemplateParameter())
1436 return true;
1437
1438 // Skip friends and local extern declarations unless they're the first
1439 // declaration of the entity.
1440 if ((D->isLocalExternDecl() || D->getFriendObjectKind()) &&
1441 D != D->getCanonicalDecl())
1442 return true;
1443
1444 // Skip template specializations.
1445 // FIXME: This feels like a hack. Should DeclarationName support
1446 // template-ids, or is there a better way to keep specializations
1447 // from being visible?
1448 if (isa<ClassTemplateSpecializationDecl>(D))
1449 return true;
1450 if (auto *FD = dyn_cast<FunctionDecl>(D))
1451 if (FD->isFunctionTemplateSpecialization())
1452 return true;
1453
1454 // Hide destructors that are invalid. There should always be one destructor,
1455 // but if it is an invalid decl, another one is created. We need to hide the
1456 // invalid one from places that expect exactly one destructor, like the
1457 // serialization code.
1458 if (isa<CXXDestructorDecl>(D) && D->isInvalidDecl())
1459 return true;
1460
1461 return false;
1462 }
1463
removeDecl(Decl * D)1464 void DeclContext::removeDecl(Decl *D) {
1465 assert(D->getLexicalDeclContext() == this &&
1466 "decl being removed from non-lexical context");
1467 assert((D->NextInContextAndBits.getPointer() || D == LastDecl) &&
1468 "decl is not in decls list");
1469
1470 // Remove D from the decl chain. This is O(n) but hopefully rare.
1471 if (D == FirstDecl) {
1472 if (D == LastDecl)
1473 FirstDecl = LastDecl = nullptr;
1474 else
1475 FirstDecl = D->NextInContextAndBits.getPointer();
1476 } else {
1477 for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) {
1478 assert(I && "decl not found in linked list");
1479 if (I->NextInContextAndBits.getPointer() == D) {
1480 I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer());
1481 if (D == LastDecl) LastDecl = I;
1482 break;
1483 }
1484 }
1485 }
1486
1487 // Mark that D is no longer in the decl chain.
1488 D->NextInContextAndBits.setPointer(nullptr);
1489
1490 // Remove D from the lookup table if necessary.
1491 if (isa<NamedDecl>(D)) {
1492 auto *ND = cast<NamedDecl>(D);
1493
1494 // Do not try to remove the declaration if that is invisible to qualified
1495 // lookup. E.g. template specializations are skipped.
1496 if (shouldBeHidden(ND))
1497 return;
1498
1499 // Remove only decls that have a name
1500 if (!ND->getDeclName())
1501 return;
1502
1503 auto *DC = D->getDeclContext();
1504 do {
1505 StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr;
1506 if (Map) {
1507 StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName());
1508 assert(Pos != Map->end() && "no lookup entry for decl");
1509 Pos->second.remove(ND);
1510 }
1511 } while (DC->isTransparentContext() && (DC = DC->getParent()));
1512 }
1513 }
1514
addHiddenDecl(Decl * D)1515 void DeclContext::addHiddenDecl(Decl *D) {
1516 assert(D->getLexicalDeclContext() == this &&
1517 "Decl inserted into wrong lexical context");
1518 assert(!D->getNextDeclInContext() && D != LastDecl &&
1519 "Decl already inserted into a DeclContext");
1520
1521 if (FirstDecl) {
1522 LastDecl->NextInContextAndBits.setPointer(D);
1523 LastDecl = D;
1524 } else {
1525 FirstDecl = LastDecl = D;
1526 }
1527
1528 // Notify a C++ record declaration that we've added a member, so it can
1529 // update its class-specific state.
1530 if (auto *Record = dyn_cast<CXXRecordDecl>(this))
1531 Record->addedMember(D);
1532
1533 // If this is a newly-created (not de-serialized) import declaration, wire
1534 // it in to the list of local import declarations.
1535 if (!D->isFromASTFile()) {
1536 if (auto *Import = dyn_cast<ImportDecl>(D))
1537 D->getASTContext().addedLocalImportDecl(Import);
1538 }
1539 }
1540
addDecl(Decl * D)1541 void DeclContext::addDecl(Decl *D) {
1542 addHiddenDecl(D);
1543
1544 if (auto *ND = dyn_cast<NamedDecl>(D))
1545 ND->getDeclContext()->getPrimaryContext()->
1546 makeDeclVisibleInContextWithFlags(ND, false, true);
1547 }
1548
addDeclInternal(Decl * D)1549 void DeclContext::addDeclInternal(Decl *D) {
1550 addHiddenDecl(D);
1551
1552 if (auto *ND = dyn_cast<NamedDecl>(D))
1553 ND->getDeclContext()->getPrimaryContext()->
1554 makeDeclVisibleInContextWithFlags(ND, true, true);
1555 }
1556
1557 /// buildLookup - Build the lookup data structure with all of the
1558 /// declarations in this DeclContext (and any other contexts linked
1559 /// to it or transparent contexts nested within it) and return it.
1560 ///
1561 /// Note that the produced map may miss out declarations from an
1562 /// external source. If it does, those entries will be marked with
1563 /// the 'hasExternalDecls' flag.
buildLookup()1564 StoredDeclsMap *DeclContext::buildLookup() {
1565 assert(this == getPrimaryContext() && "buildLookup called on non-primary DC");
1566
1567 if (!hasLazyLocalLexicalLookups() &&
1568 !hasLazyExternalLexicalLookups())
1569 return LookupPtr;
1570
1571 SmallVector<DeclContext *, 2> Contexts;
1572 collectAllContexts(Contexts);
1573
1574 if (hasLazyExternalLexicalLookups()) {
1575 setHasLazyExternalLexicalLookups(false);
1576 for (auto *DC : Contexts) {
1577 if (DC->hasExternalLexicalStorage()) {
1578 bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage();
1579 setHasLazyLocalLexicalLookups(
1580 hasLazyLocalLexicalLookups() | LoadedDecls );
1581 }
1582 }
1583
1584 if (!hasLazyLocalLexicalLookups())
1585 return LookupPtr;
1586 }
1587
1588 for (auto *DC : Contexts)
1589 buildLookupImpl(DC, hasExternalVisibleStorage());
1590
1591 // We no longer have any lazy decls.
1592 setHasLazyLocalLexicalLookups(false);
1593 return LookupPtr;
1594 }
1595
1596 /// buildLookupImpl - Build part of the lookup data structure for the
1597 /// declarations contained within DCtx, which will either be this
1598 /// DeclContext, a DeclContext linked to it, or a transparent context
1599 /// nested within it.
buildLookupImpl(DeclContext * DCtx,bool Internal)1600 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) {
1601 for (auto *D : DCtx->noload_decls()) {
1602 // Insert this declaration into the lookup structure, but only if
1603 // it's semantically within its decl context. Any other decls which
1604 // should be found in this context are added eagerly.
1605 //
1606 // If it's from an AST file, don't add it now. It'll get handled by
1607 // FindExternalVisibleDeclsByName if needed. Exception: if we're not
1608 // in C++, we do not track external visible decls for the TU, so in
1609 // that case we need to collect them all here.
1610 if (auto *ND = dyn_cast<NamedDecl>(D))
1611 if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) &&
1612 (!ND->isFromASTFile() ||
1613 (isTranslationUnit() &&
1614 !getParentASTContext().getLangOpts().CPlusPlus)))
1615 makeDeclVisibleInContextImpl(ND, Internal);
1616
1617 // If this declaration is itself a transparent declaration context
1618 // or inline namespace, add the members of this declaration of that
1619 // context (recursively).
1620 if (auto *InnerCtx = dyn_cast<DeclContext>(D))
1621 if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace())
1622 buildLookupImpl(InnerCtx, Internal);
1623 }
1624 }
1625
1626 DeclContext::lookup_result
lookup(DeclarationName Name) const1627 DeclContext::lookup(DeclarationName Name) const {
1628 assert(getDeclKind() != Decl::LinkageSpec &&
1629 getDeclKind() != Decl::Export &&
1630 "should not perform lookups into transparent contexts");
1631
1632 const DeclContext *PrimaryContext = getPrimaryContext();
1633 if (PrimaryContext != this)
1634 return PrimaryContext->lookup(Name);
1635
1636 // If we have an external source, ensure that any later redeclarations of this
1637 // context have been loaded, since they may add names to the result of this
1638 // lookup (or add external visible storage).
1639 ExternalASTSource *Source = getParentASTContext().getExternalSource();
1640 if (Source)
1641 (void)cast<Decl>(this)->getMostRecentDecl();
1642
1643 if (hasExternalVisibleStorage()) {
1644 assert(Source && "external visible storage but no external source?");
1645
1646 if (hasNeedToReconcileExternalVisibleStorage())
1647 reconcileExternalVisibleStorage();
1648
1649 StoredDeclsMap *Map = LookupPtr;
1650
1651 if (hasLazyLocalLexicalLookups() ||
1652 hasLazyExternalLexicalLookups())
1653 // FIXME: Make buildLookup const?
1654 Map = const_cast<DeclContext*>(this)->buildLookup();
1655
1656 if (!Map)
1657 Map = CreateStoredDeclsMap(getParentASTContext());
1658
1659 // If we have a lookup result with no external decls, we are done.
1660 std::pair<StoredDeclsMap::iterator, bool> R =
1661 Map->insert(std::make_pair(Name, StoredDeclsList()));
1662 if (!R.second && !R.first->second.hasExternalDecls())
1663 return R.first->second.getLookupResult();
1664
1665 if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) {
1666 if (StoredDeclsMap *Map = LookupPtr) {
1667 StoredDeclsMap::iterator I = Map->find(Name);
1668 if (I != Map->end())
1669 return I->second.getLookupResult();
1670 }
1671 }
1672
1673 return {};
1674 }
1675
1676 StoredDeclsMap *Map = LookupPtr;
1677 if (hasLazyLocalLexicalLookups() ||
1678 hasLazyExternalLexicalLookups())
1679 Map = const_cast<DeclContext*>(this)->buildLookup();
1680
1681 if (!Map)
1682 return {};
1683
1684 StoredDeclsMap::iterator I = Map->find(Name);
1685 if (I == Map->end())
1686 return {};
1687
1688 return I->second.getLookupResult();
1689 }
1690
1691 DeclContext::lookup_result
noload_lookup(DeclarationName Name)1692 DeclContext::noload_lookup(DeclarationName Name) {
1693 assert(getDeclKind() != Decl::LinkageSpec &&
1694 getDeclKind() != Decl::Export &&
1695 "should not perform lookups into transparent contexts");
1696
1697 DeclContext *PrimaryContext = getPrimaryContext();
1698 if (PrimaryContext != this)
1699 return PrimaryContext->noload_lookup(Name);
1700
1701 loadLazyLocalLexicalLookups();
1702 StoredDeclsMap *Map = LookupPtr;
1703 if (!Map)
1704 return {};
1705
1706 StoredDeclsMap::iterator I = Map->find(Name);
1707 return I != Map->end() ? I->second.getLookupResult()
1708 : lookup_result();
1709 }
1710
1711 // If we have any lazy lexical declarations not in our lookup map, add them
1712 // now. Don't import any external declarations, not even if we know we have
1713 // some missing from the external visible lookups.
loadLazyLocalLexicalLookups()1714 void DeclContext::loadLazyLocalLexicalLookups() {
1715 if (hasLazyLocalLexicalLookups()) {
1716 SmallVector<DeclContext *, 2> Contexts;
1717 collectAllContexts(Contexts);
1718 for (auto *Context : Contexts)
1719 buildLookupImpl(Context, hasExternalVisibleStorage());
1720 setHasLazyLocalLexicalLookups(false);
1721 }
1722 }
1723
localUncachedLookup(DeclarationName Name,SmallVectorImpl<NamedDecl * > & Results)1724 void DeclContext::localUncachedLookup(DeclarationName Name,
1725 SmallVectorImpl<NamedDecl *> &Results) {
1726 Results.clear();
1727
1728 // If there's no external storage, just perform a normal lookup and copy
1729 // the results.
1730 if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) {
1731 lookup_result LookupResults = lookup(Name);
1732 Results.insert(Results.end(), LookupResults.begin(), LookupResults.end());
1733 return;
1734 }
1735
1736 // If we have a lookup table, check there first. Maybe we'll get lucky.
1737 // FIXME: Should we be checking these flags on the primary context?
1738 if (Name && !hasLazyLocalLexicalLookups() &&
1739 !hasLazyExternalLexicalLookups()) {
1740 if (StoredDeclsMap *Map = LookupPtr) {
1741 StoredDeclsMap::iterator Pos = Map->find(Name);
1742 if (Pos != Map->end()) {
1743 Results.insert(Results.end(),
1744 Pos->second.getLookupResult().begin(),
1745 Pos->second.getLookupResult().end());
1746 return;
1747 }
1748 }
1749 }
1750
1751 // Slow case: grovel through the declarations in our chain looking for
1752 // matches.
1753 // FIXME: If we have lazy external declarations, this will not find them!
1754 // FIXME: Should we CollectAllContexts and walk them all here?
1755 for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) {
1756 if (auto *ND = dyn_cast<NamedDecl>(D))
1757 if (ND->getDeclName() == Name)
1758 Results.push_back(ND);
1759 }
1760 }
1761
getRedeclContext()1762 DeclContext *DeclContext::getRedeclContext() {
1763 DeclContext *Ctx = this;
1764
1765 // In C, a record type is the redeclaration context for its fields only. If
1766 // we arrive at a record context after skipping anything else, we should skip
1767 // the record as well. Currently, this means skipping enumerations because
1768 // they're the only transparent context that can exist within a struct or
1769 // union.
1770 bool SkipRecords = getDeclKind() == Decl::Kind::Enum &&
1771 !getParentASTContext().getLangOpts().CPlusPlus;
1772
1773 // Skip through contexts to get to the redeclaration context. Transparent
1774 // contexts are always skipped.
1775 while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext())
1776 Ctx = Ctx->getParent();
1777 return Ctx;
1778 }
1779
getEnclosingNamespaceContext()1780 DeclContext *DeclContext::getEnclosingNamespaceContext() {
1781 DeclContext *Ctx = this;
1782 // Skip through non-namespace, non-translation-unit contexts.
1783 while (!Ctx->isFileContext())
1784 Ctx = Ctx->getParent();
1785 return Ctx->getPrimaryContext();
1786 }
1787
getOuterLexicalRecordContext()1788 RecordDecl *DeclContext::getOuterLexicalRecordContext() {
1789 // Loop until we find a non-record context.
1790 RecordDecl *OutermostRD = nullptr;
1791 DeclContext *DC = this;
1792 while (DC->isRecord()) {
1793 OutermostRD = cast<RecordDecl>(DC);
1794 DC = DC->getLexicalParent();
1795 }
1796 return OutermostRD;
1797 }
1798
InEnclosingNamespaceSetOf(const DeclContext * O) const1799 bool DeclContext::InEnclosingNamespaceSetOf(const DeclContext *O) const {
1800 // For non-file contexts, this is equivalent to Equals.
1801 if (!isFileContext())
1802 return O->Equals(this);
1803
1804 do {
1805 if (O->Equals(this))
1806 return true;
1807
1808 const auto *NS = dyn_cast<NamespaceDecl>(O);
1809 if (!NS || !NS->isInline())
1810 break;
1811 O = NS->getParent();
1812 } while (O);
1813
1814 return false;
1815 }
1816
makeDeclVisibleInContext(NamedDecl * D)1817 void DeclContext::makeDeclVisibleInContext(NamedDecl *D) {
1818 DeclContext *PrimaryDC = this->getPrimaryContext();
1819 DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext();
1820 // If the decl is being added outside of its semantic decl context, we
1821 // need to ensure that we eagerly build the lookup information for it.
1822 PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC);
1823 }
1824
makeDeclVisibleInContextWithFlags(NamedDecl * D,bool Internal,bool Recoverable)1825 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
1826 bool Recoverable) {
1827 assert(this == getPrimaryContext() && "expected a primary DC");
1828
1829 if (!isLookupContext()) {
1830 if (isTransparentContext())
1831 getParent()->getPrimaryContext()
1832 ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1833 return;
1834 }
1835
1836 // Skip declarations which should be invisible to name lookup.
1837 if (shouldBeHidden(D))
1838 return;
1839
1840 // If we already have a lookup data structure, perform the insertion into
1841 // it. If we might have externally-stored decls with this name, look them
1842 // up and perform the insertion. If this decl was declared outside its
1843 // semantic context, buildLookup won't add it, so add it now.
1844 //
1845 // FIXME: As a performance hack, don't add such decls into the translation
1846 // unit unless we're in C++, since qualified lookup into the TU is never
1847 // performed.
1848 if (LookupPtr || hasExternalVisibleStorage() ||
1849 ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) &&
1850 (getParentASTContext().getLangOpts().CPlusPlus ||
1851 !isTranslationUnit()))) {
1852 // If we have lazily omitted any decls, they might have the same name as
1853 // the decl which we are adding, so build a full lookup table before adding
1854 // this decl.
1855 buildLookup();
1856 makeDeclVisibleInContextImpl(D, Internal);
1857 } else {
1858 setHasLazyLocalLexicalLookups(true);
1859 }
1860
1861 // If we are a transparent context or inline namespace, insert into our
1862 // parent context, too. This operation is recursive.
1863 if (isTransparentContext() || isInlineNamespace())
1864 getParent()->getPrimaryContext()->
1865 makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1866
1867 auto *DCAsDecl = cast<Decl>(this);
1868 // Notify that a decl was made visible unless we are a Tag being defined.
1869 if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined()))
1870 if (ASTMutationListener *L = DCAsDecl->getASTMutationListener())
1871 L->AddedVisibleDecl(this, D);
1872 }
1873
makeDeclVisibleInContextImpl(NamedDecl * D,bool Internal)1874 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
1875 // Find or create the stored declaration map.
1876 StoredDeclsMap *Map = LookupPtr;
1877 if (!Map) {
1878 ASTContext *C = &getParentASTContext();
1879 Map = CreateStoredDeclsMap(*C);
1880 }
1881
1882 // If there is an external AST source, load any declarations it knows about
1883 // with this declaration's name.
1884 // If the lookup table contains an entry about this name it means that we
1885 // have already checked the external source.
1886 if (!Internal)
1887 if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
1888 if (hasExternalVisibleStorage() &&
1889 Map->find(D->getDeclName()) == Map->end())
1890 Source->FindExternalVisibleDeclsByName(this, D->getDeclName());
1891
1892 // Insert this declaration into the map.
1893 StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()];
1894
1895 if (Internal) {
1896 // If this is being added as part of loading an external declaration,
1897 // this may not be the only external declaration with this name.
1898 // In this case, we never try to replace an existing declaration; we'll
1899 // handle that when we finalize the list of declarations for this name.
1900 DeclNameEntries.setHasExternalDecls();
1901 DeclNameEntries.prependDeclNoReplace(D);
1902 return;
1903 }
1904
1905 DeclNameEntries.addOrReplaceDecl(D);
1906 }
1907
operator *() const1908 UsingDirectiveDecl *DeclContext::udir_iterator::operator*() const {
1909 return cast<UsingDirectiveDecl>(*I);
1910 }
1911
1912 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within
1913 /// this context.
using_directives() const1914 DeclContext::udir_range DeclContext::using_directives() const {
1915 // FIXME: Use something more efficient than normal lookup for using
1916 // directives. In C++, using directives are looked up more than anything else.
1917 lookup_result Result = lookup(UsingDirectiveDecl::getName());
1918 return udir_range(Result.begin(), Result.end());
1919 }
1920
1921 //===----------------------------------------------------------------------===//
1922 // Creation and Destruction of StoredDeclsMaps. //
1923 //===----------------------------------------------------------------------===//
1924
CreateStoredDeclsMap(ASTContext & C) const1925 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const {
1926 assert(!LookupPtr && "context already has a decls map");
1927 assert(getPrimaryContext() == this &&
1928 "creating decls map on non-primary context");
1929
1930 StoredDeclsMap *M;
1931 bool Dependent = isDependentContext();
1932 if (Dependent)
1933 M = new DependentStoredDeclsMap();
1934 else
1935 M = new StoredDeclsMap();
1936 M->Previous = C.LastSDM;
1937 C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent);
1938 LookupPtr = M;
1939 return M;
1940 }
1941
ReleaseDeclContextMaps()1942 void ASTContext::ReleaseDeclContextMaps() {
1943 // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap
1944 // pointer because the subclass doesn't add anything that needs to
1945 // be deleted.
1946 StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt());
1947 }
1948
DestroyAll(StoredDeclsMap * Map,bool Dependent)1949 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) {
1950 while (Map) {
1951 // Advance the iteration before we invalidate memory.
1952 llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous;
1953
1954 if (Dependent)
1955 delete static_cast<DependentStoredDeclsMap*>(Map);
1956 else
1957 delete Map;
1958
1959 Map = Next.getPointer();
1960 Dependent = Next.getInt();
1961 }
1962 }
1963
Create(ASTContext & C,DeclContext * Parent,const PartialDiagnostic & PDiag)1964 DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C,
1965 DeclContext *Parent,
1966 const PartialDiagnostic &PDiag) {
1967 assert(Parent->isDependentContext()
1968 && "cannot iterate dependent diagnostics of non-dependent context");
1969 Parent = Parent->getPrimaryContext();
1970 if (!Parent->LookupPtr)
1971 Parent->CreateStoredDeclsMap(C);
1972
1973 auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr);
1974
1975 // Allocate the copy of the PartialDiagnostic via the ASTContext's
1976 // BumpPtrAllocator, rather than the ASTContext itself.
1977 DiagnosticStorage *DiagStorage = nullptr;
1978 if (PDiag.hasStorage())
1979 DiagStorage = new (C) DiagnosticStorage;
1980
1981 auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage);
1982
1983 // TODO: Maybe we shouldn't reverse the order during insertion.
1984 DD->NextDiagnostic = Map->FirstDiagnostic;
1985 Map->FirstDiagnostic = DD;
1986
1987 return DD;
1988 }
1989